Spring shade-roller



(No Model.)

D. E. KEMPSTER.

SPRING SHADE ROLLER.

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PATENT DANIELE. KEB'IPSTER, OFBOVSTON, MASSACHUSETTS.

SPRING SHADE-ROLLER.

SPECIFICATION forming part of Letters Patent No. 286,309, dated October 9, 188B.

(No model.)

T0 all whom it may concern,.-

Beit known that l, DANIEL E. KnMrsrnn, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Spring Shade-Rollers 5 and I do hereby declare that the same are fully described in the following specification and illustrated in the accompanying drawings.

My invention relates to that class of shaderollers in which a coiled spring located in the roller is employed to raise and sustain the curtain or window-shade; and it consists in an improvement in the construction of the brackets, and also. on the construction and arrangement shown in United States Patent No. 183,809, granted to A. H. Knapp. In the above patent one or more pins are driven into the end of the shade-roller, and a pivoted pawl, operated by centrifugal force, engages the aforesaid pins and locks the spring from unwinding when the roller is removed from its brackets. Now, I prefer to use rings with stops on their inner sides, and having spurs or means on the back to attach itself to the roller end instead of the pins driven into the roller end. The rings are held in position and the roller end is prevented from splitting by a metal cap; but, if desired, pins may be driven in as heretofore, and the metal cap covers them up and protects the roller end from injury. In the above patent referred to the plate, which is attached to the spindle, and on which the centrifugal pawl is pivoted, is provided on its outer face with a projection. A corresponding projection is arranged on the inner face of the bracket. The former is arranged to strike the latter, and thereby prevent the insertion of the spindle in the bracket-notch, except when the spindle is right side up, to bring the pawl into a self-gravitating position'i'or keeping it out oi' contact with the pins or projections on the roller end. Now, the objections to the above arrangement are: It necessitates great care and accuracy in the making and puttin g together the several parts, for if the brackets vary in thickness or the notch in the spindies varies in width, the projections on the bracket and pawl plate are very liable to either be so far from each other or so near to cach other as to completely destroy `the object for which they are intended; also, a very great objection is the lo cking device arranged on the outside of the roller end, where it must necessarily be when said locking device is constructed with projections intended to come in contact with corresponding projections on the bracket, and thus insure its being placed in said brackets right side up. Such arrangements cannot be covered up and protected by a metal ferrule, and in the ordinary handling in transportation are constantly becoming broken or bent out oi' shape, so as to be inoperative. Furthermore, rollers witllout ferrules, and having pins or projections driven into their ends for the pawl or lock to strike or catch againstby the force of the spring, are very liable, and do frequently, split out the ends of the rollers-especially after they have been up to the windows sometime and become thoroughly dry and brittle, and more especially if the spring is a moderately heavy one.

Now, my. improvement has for its object to overcome all these objections and produce a more simple and durable roller, which will be less liable to get out of order, which I accomplish in the following manner, reference being had to the accompanying drawings, on Which- Figure 1 is a sectional elevation ofthe shaderoller resting in its brackets. Fig. 2 is a crosssection on the line V W shown in Fig. 1, the centrifugal pawl being shown as locked. Fig. 43 is an end view seen from U in Fig. 1. Fig. 4 is a section on the line .r y shown in Fig. 3. Fig. 5 is the pawl or lock-plate, and its pawl or lock. Fig. 6 is the ring-stop. Fig. 7 is a modification of my improvement, as will be more fully described. Fig. 8 is the brackets.

.In the drawings, c represents the curtain or shade roller. b is the tubular roller end cap. c is the fixed spindle at the spring end of the roller, and d is the bracket in which said spindle is mounted. The tubular end cap, b, is preferably made of hard wood, and forms a part of the roller a., and it is bored through considerably larger than the spindle c. The bore is enlarged on the inner side, and extends in, leaving a sufficient thickness, b', of the cap for holding the pins or ring-stop b,vvl1ich are attached to the end cap, b. The shell or portion of the cap I) which has the enlarged bore enters into and is inclosed Within the bore oi' the roller c.

IOO

0n the spindle c, and within the j said shell, and next the portion b ofthe cap b,

. on which a loose pawl, j', is pivoted.

is an enlarged journal of felt, o', or friction niaterial such as claimed in United States Patent No. 251,893, granted to ine January 3, 1882. A washer, of, is interposed between said journal and the portion b ofthe cap. On the spindle c, outside of the cap b, is a' 4fixed plate, e, The spindle c 'rests in the bracket d, with the pawl j' uppermost, as shown in Figs. I and 2, so that said pawl by its own gravity will drop away froin the stops b, and remains out of contact therewith as long as the roller is mounted in its brackets, and thus not interfere with the revolution of the roller therein. The pawl f rests over the spindle in this position: The end of the spindle c is provided with a lip, 0',

on one side, whichl fits a corresponding cavity,

d', in one side of vthe notch on the bracket d, thus insuring its being put in only one wayright side up. l Now, having transferred the (zo-operating projection from the pawl-plate c to the end of the spindle itself, I ani enabled to cover the aforesaid centrifugal locking device and roller end with a nieta] ferrule, h, and thus protect it from injury; and to giveboth ends of the roller the sanie iinished appearance, I also place a inetal ferrule over the end block, on which is the journal a. Vhen the spindle c is taken from the bracket by removing the roller, the spring g in the roller .immediately revolves the spindle, whereby centrifugal action is imparted to the pawlf, causing it to iiy out au d engage one of the stops' b and prevent any further uncoiling of the spring. This spring, as will be seen by reference to Fig. l, is formed with refolded or redoubled layers, and the ends of the saine are fastened to the cap I) and the spindle c, respectively. As shown in Fig. l, the solid end of the roller a has a hard-wood end block, with a journal, (i, which runs loosely in a friction'- bearing or ring of felt, a, contained in the ring a of the bracket am. Asshown in Fig.

5, "I inake the pawl-plate e with ears e for overlapping and loosely holding the pawl or lock, but without any projections for engagement with the bracket. It will also be seen that the ferrule 7L conies up to and in contact with the stops b, thus securely holding them in place and preventing the pawl froin ever slipping over the ends of said stops, as is frequently the case when the spindlec has a little too inuch end-play in the roller c. The spring. g is balanced by the felt frictional j ournal and bearing aforesaid, and a weighted bottoni slat in the shade or curtain. The modification shown in Fig. 7 is the device adapted as a stop-roller by being turned upside down, the lip on the spindle end being niade on the opposite side, and thus holds it in the bracket in that position. As shown in Fig. 8, the brackets d, am, and I are constructed with a single screw-hole drawn-foot with prodsj j. That I niean by a drawn-foot is one which is so shaped as to be capable of being drawn froin the mold and leave said mold in a condition to cast the foot complete with screw-hole, thus save the necessity of any drilling. The bracket I. has atapering pivot, i, and is used with an end block having a central hole, this being preferable in sonne cases where less friction is required than when the journal a and ring-head bracket am are used.

What I claim is- Ina spring shade-roller, the coinbination of 75 the roller a, spindle c, provided withthe lip 0', pawlf, pawl-plate e, cap b, with stops b, washer c, journal c', spring g, journal a, and the inetal cap or ferrule h, as set forth.

In testimony whereof I-have affixed my signature in presence of two witnesses.

DANIEL E. KEMPSTER.

Viinesses:

HENRY CHADnoUnN, Finnois ALLEN. 

